Sökning: "havsis"

Visar resultat 1 - 5 av 7 avhandlingar innehållade ordet havsis.

  1. 1. Seasonal Cycling of Mercury in the Antarctic Sea Ice Environment

    Författare :Michelle Nerentorp; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Antarktis; säsongsvariationer; vinter; Kvicksilver; havsis; snö; deposition;

    Sammanfattning : Mercury is a globally distributed contaminant that exists in the atmosphere as a stable monoatomic gas. Having almost a year’s residence time in the air allows it to reach remote polar regions. Deposited airborne mercury can be transformed in the environment to the organic and bio-accumulating compound methyl mercury. LÄS MER

  3. 2. The role of biogeophysical feedbacks and their impacts in the arctic and boreal climate system

    Författare :Wenxin Zhang; Institutionen för naturgeografi och ekosystemvetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arctic and boreal vegetation change; Biogeophysical feedbacks; Albedo; Latent heat; Carbon budget; Representative concentration pathways; Eearth system model; LPJ-GUESS; RCA; Sea ice;

    Sammanfattning : The physical environment in the northern high latitudes including the Arctic cryosphere has undergone dramatic changes due to anthropogenic greenhouse gas warming, which since pre-industrial times has been twice or more the rate of global mean warming. Global climate models predict that this accelerated warming will continue for at least the next few decades. LÄS MER

  4. 3. The constitutive power of maps in the Arctic

    Författare :Helena Gonzales Lindberg; BECC: Biodiversity and Ecosystem services in a Changing Climate; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Maps; Power; Politics; Representation; Visual politics; Critical cartography; the Arctic; Google Maps; NSIDC; USGS; kartor; makt; politik; representationer; visuell politik; kritisk kartografi; Arktis; Google Maps; NSIDC; USGS;

    Sammanfattning : As maps are widely used, circulated, and recognised, they have consequences for how people view and understand the world. They mediate political meaning-making and frame the conditions for political alternatives to emerge or to be silenced. LÄS MER

  5. 4. Efficient commuter craft for urban waterborne public transportation

    Författare :Harsha Cheemakurthy; Karl Garme; Joakim Kalantari; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; waterborne public transportation; commuter ferry; modular design; operational requirements; ranking method; sustainable performance; ice operations; ice-hull Interaction; ice load; ice properties; kollektivtrafik på vatten; modulärt färjekoncept; modulär design; rankningsmetod; hållbarhetsparametrar; isbelastning; isförhållanden; isegenskaper; Vehicle and Maritime Engineering; Farkostteknik;

    Sammanfattning : There has been a recent surge in interest in waterborne public transportation (WPT). Publictransport providers (PTP) are seeing its potential in complementing the existing transportnetwork and alleviating urban traffic congestion and pollution. But the adoption of WPTtoday is challenging due to a series of technical and implementation challenges. LÄS MER

  7. 5. Modelling the early to mid-Holocene Arctic climate

    Författare :Marit Berger; Arne Johansson; Rodrigo Caballero; KTH; []
    Nyckelord :Arctic; early Holocene; mid-Holocene; climate modelling; paleoclimate; sea ice; climate change;

    Sammanfattning : In the recent past it has become evident that the Earth's climate is changing, and that human activity play a significant role in these changes. One of the regions where the ongoing climate change has been most evident is in the Arctic: the surface temperature has increased twice as much in this region as compared to the global average, in addition, a significant decline in the Arctic sea-ice extent has been observed in the past decades. LÄS MER